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<h1>navo/algorithm/hash/string/ap.c</h1>  </div>
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<a href="ap_8c.html">浏览该文件的文档。</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */</span>
<a name="l00011"></a>00011 <span class="preprocessor">#include &quot;<a class="code" href="ap_8h.html" title="AP string hash.">ap.h</a>&quot;</span>
<a name="l00012"></a>00012 
<a name="l00013"></a>00013 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {
<a name="l00015"></a>00015 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00016"></a>00016 
<a name="l00017"></a>00017 NV_IMPL <span class="keywordtype">void</span> __ap_update(<a class="code" href="structap__ctx.html" title="AP哈希上下文">ap_ctx</a>* ctx, <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* buf, <span class="keywordtype">size_t</span> cnt)
<a name="l00018"></a>00018 {
<a name="l00019"></a>00019     uint32_t hash = ctx-&gt;<a class="code" href="structap__ctx.html#a11ecb029164e055f28f4123ce3748862" title="哈希值">hash</a>;
<a name="l00020"></a>00020     <span class="keywordtype">size_t</span> i;
<a name="l00021"></a>00021 
<a name="l00022"></a>00022     <span class="keywordflow">for</span> (i = 0; i &lt; cnt;) {
<a name="l00023"></a>00023         <span class="keywordflow">if</span> (i++ &amp; 1)
<a name="l00024"></a>00024             hash ^= (~((hash &lt;&lt; 11) ^ (hash &gt;&gt; 5) ^ *buf++));
<a name="l00025"></a>00025         <span class="keywordflow">else</span>
<a name="l00026"></a>00026             hash ^= ((hash &lt;&lt; 7) ^ (hash &gt;&gt; 3) ^ *buf++);
<a name="l00027"></a>00027     }
<a name="l00028"></a>00028 
<a name="l00029"></a>00029     ctx-&gt;<a class="code" href="structap__ctx.html#a11ecb029164e055f28f4123ce3748862" title="哈希值">hash</a> = hash;
<a name="l00030"></a>00030 }
<a name="l00031"></a>00031 
<a name="l00032"></a><a class="code" href="group__AP.html#ga90a9aa50c8bc12ebd53ac088c7aaed8d">00032</a> NV_IMPL uint32_t <a class="code" href="group__AP.html#ga90a9aa50c8bc12ebd53ac088c7aaed8d" title="直接哈希字符串">ap_hash_nbstr</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* str)
<a name="l00033"></a>00033 {
<a name="l00034"></a>00034     uint32_t hash = 0xAAAAAAAAUL;
<a name="l00035"></a>00035     <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a> ch;
<a name="l00036"></a>00036     <span class="keywordtype">size_t</span> i;
<a name="l00037"></a>00037 
<a name="l00038"></a>00038     <span class="keywordflow">for</span> (i = 0; (ch = *str++);) {
<a name="l00039"></a>00039         <span class="keywordflow">if</span> (i++ &amp; 1)
<a name="l00040"></a>00040             hash ^= (~((hash &lt;&lt; 11) ^ (hash &gt;&gt; 5) ^ ch));
<a name="l00041"></a>00041         <span class="keywordflow">else</span>
<a name="l00042"></a>00042             hash ^= ((hash &lt;&lt; 7) ^ (hash &gt;&gt; 3) ^ ch);
<a name="l00043"></a>00043     }
<a name="l00044"></a>00044 
<a name="l00045"></a>00045     <span class="keywordflow">return</span> __cpu_to_le32(hash);
<a name="l00046"></a>00046 }
<a name="l00047"></a>00047 
<a name="l00048"></a>00048 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span>}
<a name="l00050"></a>00050 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
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